Saw-set.



PATENTED JUNE 11, 1907.

J. PAIX. SAW SET, APPLIoATIoN :FILED DB0. 24.`19oe.

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UNITED STATES PATENT OFFICE.

SAW-SET.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed December 24,1906. Serial No. 349,714.

ive in operation, and which can be readily adjusted to operate upon saws having teeth of different sizes.

In the accompanying drawing, Figure 1 is a side view of my improved saw set Fig. 2 is a longitudinal section thereof; Fig. 3 is a transverse section on the line 3-3 of Fig. 2 looking toward the arms; Fig. 4 is a transverse section on the same line looking toward the anvil Fig. 5 is a plan view of the anvil detached; Fig. 6 is a perspective view of the hammer lever detached;,F ig. 7 is a plan view of the bridge detached; Fig. 8 is a perspective view of the hook lever detached; Fig. 9 is a section on the line 9n9 of Fig. 3 Fig. 10 is a plan view of a nut.

AReferring to the drawing, 1 indicates the lower arm of my improved saw set, and 2 the upper arm, normally extended from each other by means of a spring 3. Each of these arms 1, 2, is constructed of a piece of sheet metal bent into a trough-shaped form, and the lower arm is extended upward and then forward and downward to form a guide 4 to receive the edge of the saw which is to be set. The sides of said arm at its front end are connected by a base 5 integral with the sides. An anvil 6 is received between said base and a bridge 7 secured between the sides and is vheld therebetween by means of a bolt S, the

upper portion of the bolt being square and passed through a square hole 9 in the bridge and through a hole l() in the anvil, which hole is also square in the upper portion. A nut 11 is screwed upon the lower end of said bolt. The four sides of said anvil slope outwardly downward, and the upper edge of each side is beveled as shown at 12 to correspond with the desired set to be given to the teeth of the saW. For indicating the proper side of the anvil to be used, the top thereof is marked with the numerals 1, 2, 3, 4, in a suitable location for that purpose. By turning the anvil around on the bolt and then securing it with the proper' side adjacent to the guide for the saw blade, the desired extent of deflec* tion will be obtained. The nut 11 is formed with a cruciform flange or head 13, forming four bearings, any one of which may be employed to support the side of the saw blade when in position in the guide 4.

Between the upwardly extending walls of the lower arm, on the side of the guide opposite to the anvil, is secured the pivot pin 14 for the .upper arm, and below said pivot 14 is also secured between said walls a pivot pin 15 for the hammer lever 16. The upper' arm is cut out in the middle, as shown at 17, to permit the hammer lever to swing through the open top thereof, and said lever is curved to pass around the pivot pin 14. Its hammer 1S is adapted to strike the side of the saw tooth and deflect it against the beveled edge of the anvil, the force imparted to the hammer being derived froma powerful spring 19, one side of which rests within the trough-shaped lower arm 1, its 4middle being secured to said arm by 'a bolt 2O which also secures in place the spring 3, and the outer free end of the spring resting against a shoulder 21 formed upon the outer side of the hammer lever 16. In order to impart to said spring its force tostrike the blow against the side of the saw tooth, said spring is depressed by moving the hammer lever backward upon its pivot, and this is accomplished by means of a lever hook 22, pivoted as shown at 23,'-between the sides of the upper arm and having a hook 24 which engages a notch 25 formed in the end of the hammer lever. The operator having grasped the two arms within his hand, and. having moved the saw blade in the guide 4 until the tooth which is to be set has arrived opposite to the hammer, compresses said arms against the action of the springs 3 and 19. The 'first ell'ect of this compression is to move the jaw 26 of the upper arm into contact with the side of the saw blade, the other side of which rests against the anvil. As the arms close together, that part of the jaw which is in contact with the saw, being rounded in a curve approximating a circle with the pivot 14 as center, slides on the saw, holding it ilirmly against the anvil, and, during this motion, the hook 24 moves forward, drawing with it the lower end of the hammer lever, and moving the upper portion of said hammer lever backward, energizing the spring 19. Since thc hook 24 carried by the upper arm swings therewith upon the pivot pin 14 in an arc of greater radius than the IOO IOS

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notch 25 in the hammer lever, which swings upon the pivot pin l5, it results that at a certain point in the motion of the two arms toward each other, said hook leaves said notch, thereby releasing the hammer, which immediately springs forward under the action Yof the spring 19, and strikes a powerful blow upon the side of the saw tooth, deilecting it against the anvil. The strength of this blow can be regulated by adjusting the point at which the hook leaves the notch, and this is done by adjusting the position of the hook lever upon the upper arm, which is accomplished by means of an adjusting screw 30 screwed through a block 31 extending between the sides of said upper arm and bearing upon a shoe 32 formed on the rear end of said hook lever. By moving said screw inward, the hook 24 of the lever is moved outward relatively to the upper arm, so that it releases said hammer lever at an earlier point in the closing movement of the arms, and consequently the hammer lever is operated under a less powerful action of the spring.

In order to return the hook of the lever 22 into engagement with the notch of the hammer lever when the upper arm is released by the operator, there is provided a small spring 35, which is bent around the pivot 23 of the hook lever, and bears at one end against a shoulder 36 of said hook lever and at the other end against the block 31.

This saw set is very rapid in its action, as the teeth can be set as fast as the arms can be closed toward each other and the saw advanced to bring the next tooth into position. It is also very uniform in action, as, after having once adjusted the instrument for the saw to be acted-upon, the amount of deflection of the teeth of the saw is uniform, being independent of the will of the operator, since the spring is equally energized at each stroke,

this energization depending upon the point in its movement when the hammer is released from the hook.

1. A saw set comprising pivoted arms, an

Y-anvil carried by vone of said arms, a hammer pivoted on the latter arm and having a notch and a shoulder, a plate spring secured to said latter arm and adapted to engage said shoulder, a hook carried by the other arm and adapted to engage said notch, whereby When said arms are pressed together the hook carried by the one arm retracts the hammer carried by the other arm, said hook-carrying arm having a front rounded surface conformed to engage the side of a saw inserted between said surface and the anvil, the pivots of said arm and the hammer being so located that the continued movement of said arm on retracting the hammer withdraws the hook from said notch, substantially as described.

2. A saw set comprising two arms, a pivot pin by which said arms are pivoted together, an anvil carried by one of said arms, a hammer pivoted on said latter arm and being curved to pass behind the pivot of the two arms, its free end passing in front of said pivot toward said anvil, said hammer having a shoulder at its rear `edge and being extended beyond its pivot, and having a notch in said extended end, a plate spring secured to the hammer-carrying arm, the free end of said spring being adapted to engage said shoulder, and a hook lever secured to the other arm, the hook thereof engaging said notch, substantially as described.

In testimony whereof, I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN FAIX. I/Vitnesses:

FRANeIs M. WRIGHT, D. B. RICHARDS. 

